Powerstar W7 Inverter modification

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Re: Powerstar W7 Inverter modification

Postby Tracker » Thu Apr 04, 2013 4:22 pm

Garyho wrote:Has anybody had any experience with these inverter chargers from Taiwan?

I bought an MPPSolar charge controller and it is G.R.E.A.T.. ;)
Another chap did likewise and had some strange issues that MppS could not resolve by email,
SO - they just said "send it back" so they could test it.. He could not be bothered and just bought an OUTBACK.
Disappointing, because it would have been great to know how the repair process went...
We don't know if it was a faulty device or some incompatibility

I was looking at importing them for friends, and when I asked how we would get on for repairs, they suggested that I remove and return faulty boards..

The other guy also purchased a charger/inverter, and he is HAPPY with it, but has made no comment on actual efficiency.. His one is bigger..

I can confirm that they ARE very good on advice, and most obliging... but when push comes to shove, and one fails, then RETURN is the only solution..

"""Our inverters are NOT designed for NiCd or LiFePo4 batteries."""

Now, that is a shame..!

BTW - I did have a little fault with my CC, and they told me how to FIX it.
Annoyingly, when I spoke later about it and mentioned the "FIX", they said - "Oh, that would void your warranty"... Hello, I did what YOU said :cry:

PS
No Load Power Consumption.......<20W
Max PV Input Voltage...................45V
Peak Efficiency..........................91%
Operating/Storage Temp..............0°C ~ 55°C / -15°C~ 60°C
Solar Charger
Type, Max Charging Current PWM, max 50 Amp
Max PV Input Voc 125V

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Re: Powerstar W7 Inverter modification

Postby Garyho » Thu Apr 04, 2013 4:51 pm

Thanks, at the price I am not expecting the world but that sounds good enough for me.
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Re: Powerstar W7 Inverter modification

Postby Tracker » Thu Apr 04, 2013 5:33 pm

Garyho wrote:at the price I am not expecting the world


The only thought that I would suggest is a SEPARATE PV Charge Controller..

So that no matter what, you can keep the battery charged.
The device only has PWM charge and so you can get 30% more from an MPPT controller

The specs do suggest that STANDARD ( Voc 45V) panels could be used... That is a plus..

I would be curious about the efficiency of 91%.. Under what conditions??

Continuous/Surge Output........2.4 / 4.8KW


With the bypass circuit, it does give a realistic Stand By power function..

The only remaining issue is " Local Approvals "
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Re: Powerstar W7 Inverter modification

Postby davidg » Thu Apr 04, 2013 7:48 pm

Tracker wrote:What would you say was the real conversion cost, (excluding Labor) was.. :?:


The 2 x3000Va toroidal transformers and the filter coils, I got from overseas as that was the best price but I had to wait 3 1/2 months for them to come by sea freight otherwise I would have had to pay GST on them yes they cost less than 1K to get here, I had to go and pick them up as well, that was pain.

I had to get another new steel box/case to put it all in, add 2 x Sunon 48VDC fans, added several temperature 40degC thermo N.O switches, stuck them on the transformers and a couple of other places inside, anyone of them can turn on the fans which move much more air than I expected, made the standard fan that came in the unit look like a joke for cooling but they do make more noise, they do move a serious amount of air, each fan runs at 4000rpm and move 200cfm each, other bits and bobs, some AL for air flow direction and extra heat sinking, Air filters for the fans to keep dirt and insects out, fine stainless mesh to protect the filters from insects and make the filters removable, then paint it to make it look nice.

So all up in parts about $1600.00.

Then of course you have to add the hours, lots of them about 15 to 20 hours for the actual conversion including the remounting etc, plus the time to obtain the parts a few more hours there. I'm nowhere near as good as "Andrew_electrics" it took me longer to actually do it.

As I have said I would not do it again but it was good exercise.
If the electronics blow up then, it is very hard to get replacement parts for them, and if you check with the Ebay sellers they don't want to sell the parts, I have tried to obtain them for the when it does kill it-self.

So good for now, hopefully it will last a decent number of years. We will wait and see.
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Re: Powerstar W7 Inverter modification

Postby Tracker » Thu Apr 04, 2013 9:55 pm

.....So all up in parts about $1600.00...


Ouch.... and I paid 1k for a selectronic 3kw inverter, and a similar amount for an outback unit but BRAND NEW..
AND THE REAL ISSUE then, is that if something goes wrong with the rest of the modified powerstar, you have no means of fixing it, short of buying a new unit to rat for spares..

Yes, I agree with you, David, that it may have been a satisfying project, but a seriously questionable value project.. :oops:

Do not buy a powerstar, thinking it is economically upgradeable ... IMHO.... :roll:
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Re: Powerstar W7 Inverter modification

Postby davidg » Thu Apr 04, 2013 10:35 pm

Tracker wrote:
.....So all up in parts about $1600.00...

I paid 1k for a selectronic 3kw inverter, Yes, I agree with you, David, that it may have been a satisfying project, but a seriously questionable value project.. :oops:
.


It is a full 6KW continuous not 3Kw that Andrew did, It will and does deliver the 6 kW without complaint and does not get at all hot doing it unlike the default design. Those fans only turn on when it is a either being driven flat out for a period of time or it's a hot day, so, not often. The "green mode/standby" mode works really well now under 8watts now, peanuts. The big issue is they are pretty dumb to get the inverter to do all the things that an SP-Pro SPMC-482 does it needs a lot of extra bits added around it and that adds still more money, I did a couple minor things proper low voltage detect to shut cut the load off before the batteries are drained below 60% for instance, adjustable. Then complete unit shutoff at 50% seems basic but they don't do it until the batteries are drained much deeper than that. I could add other bits and do nearly everything that a selectronics can do. But then I might as well buy/sell a selectronics, and save myself the hassle be able to a provide a good warranty and so on and so on....................:D
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Re: Powerstar W7 Inverter modification

Postby dRdoS7 » Thu Apr 11, 2013 1:28 pm

Tracker wrote:Sorry, just noticed this question... that was likely. .... GOOD..... not root
( STUPID auto correction on tablet ).


As in "GOOD root"?

I have trouble with my wireless keyboard, usually flat(ish) batteries, many missing letters. Sort of like shorthand.

Back on topic now!

I bought one of these from MPPSolar (OK, so not really on topic, which is Powerstar W7):
http://www.ebay.com.au/itm/3000W-48V-pu ... 257c394588
Delivered very quickly (ordered on 19th, posted 20th, received on 26th November)

I installed it a couple of days later. Been going non-stop, except when I was playing around with the monitoring/controlling/logging SW. Managed to have more blackouts in one week than Powercor had in the last 2 years!

So far, so good (root?).

I use a MidnightSolar Classic 200 mppt controller, not the inbuilt 1000w in the MPPS inverter.

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Re: Powerstar W7 Inverter modification

Postby davidg » Thu Apr 11, 2013 9:11 pm

dRdoS7 wrote:I bought one of these from MPPSolar.................
Been going non-stop, except when I was playing around with the monitoring/controlling/logging SW.
Managed to have more blackouts in one week than Powercor had in the last 2 years!
So far, so good (root?).
dRdoS7.
:lol: :lol: nothing like being in the dark..........

No question they work......had a proper look at the inverter specs, at best 86% peak efficiency.
So for every kWh through it when running on batteries you throw away 14% of the power stored :(
Just worth keeping that in mind. For blackouts......I Guess..........it's OK.

I would not like to find the extra storage for off-grid use or for grid-interactive controlled use, that's a lot of extra power to find or more storage needed. compared to more a couple of brands, that's about 10% extra to find.
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An OTT Genset for a house.
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Re: Powerstar W7 Inverter modification

Postby dRdoS7 » Thu Apr 11, 2013 10:10 pm

Hi,

davidg wrote: :lol: :lol: nothing like being in the dark..........


I confined my experiments to day time hours, lucky for me my wife wasn't recording anything! No house lights anyway, only garage lights & roller doors.

davidg wrote:No question they work......had a proper look at the inverter specs, at best 86% peak efficiency.
So for every kWh through it when running on batteries you throw away 14% of the power stored


If I was running off-grid it might be a concern. I set my system up so I could export more from my existing PV system and buy less at the same time plus, a reasonable amount of backup time. It's rare for the grid to off for longer than a couple of hours, unless they're performing maint. or a car crashed into a power pole.

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Re: Powerstar W7 Inverter modification

Postby davidg » Fri Apr 12, 2013 1:05 am

dRdoS7 wrote:Hi,
If I was running off-grid it might be a concern. I set my system up so I could export more from my existing PV system and buy less at the same time plus, a reasonable amount of backup time. It's rare for the grid to off for longer than a couple of hours, unless they're performing maint. or a car crashed into a power pole.

dRdoS7.

I don't um..............OK, however it's not possible to export more with a battery backup system involved
for a start there are the losses in keeping the batteries charged, the losses in the inverter operating as a charger, and then the losses when you need to use it for battery backup. Not saying it is not a good idea from a blackout point of view. It is just not possible to export more with the battery backup system in the mix.

Assuming lead acid batteries you have to allow they're typically about 85% efficient, the losses in the charger to keep them topped up. The specs for yours do not specifically list the efficiency but do suggest 97% efficient, I wonder how efficient the charger really is in it under full load recharging the batteries if required.
So the not allowing for anything else you are about 18% worse off using batteries, that's just a fact of life, there is no way around it, unfortunately.

I use batteries, I'm on the grid, but I use an Selectronics SP-Pro I still have to allow for the same types of losses you do for the same reasons, however the inverter in the SP-Pro is 95/96% efficient when being used to provide power, I don't export more kWh, the laws of physics will not let you, but I can buy less power at peak rates. On really severely overcast or rainy days with little sun, I may have to buy power at peak rates for a short period of time, to keep the batteries at a decent SOC until off peak power time frames become available. The real cost saving is being able to buy power at the best rates.

There are distinct advantages for having an inverter like you have and you have pointed out the big one "no blackouts" when the power does fail, that's a big one. BTW it is well worth considering adding a "surge" arrester/diverter into your main switchboard before any equipment including the inverter, they provide protection against high voltage transient spikes that the grid gets from to time t otime, can save your equipment from premature failure or destruction. Sparkie required to fit.
SPS Standalone Power System/Hybrid specialist - Store the Sun!
SELECTRONIC SPMC482-AU, 8.2kW's of Arrays
Selectronic Certified AC-Coupled Fronius 8.2kW Inverter
1900Ah 48V Bank

An OTT Genset for a house.
PVOutput Stats

Sparkys light up your life :)
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