New solar panels

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Re: New solar panels

Postby crazyk » Sun Jan 22, 2017 8:27 am

I thought I'd do a little tinkering with my setup. It's not complete but I wanted to play with the controller.

So it's all connected and running but I notice that the voltage readout from the PV array jumps around a lot between 23-35V. It's not in full sun. Just standing up against the wall.

Should you typically see the voltage jump around?
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Re: New solar panels

Postby APR » Sun Jan 22, 2017 10:11 am

Put the panels out in sunlight and at an appropriate angle. The MPPT may be cycling the load on the panels to try and determine the optimum power point, and is having difficulty because the panels are not getting adequate or full panel coverage sunlight.
2 x Goodwe GW5048D-ES Hybrid inverters, 13kW panels, 20kWh LiFePO4
Mk2 PV Router feeding excess solar generation to a 3.6kW 250 ltr HWS
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Re: New solar panels

Postby crazyk » Sun Jan 22, 2017 4:59 pm

Cheers thanks for that.

So it's been running most the day and reached a peak batt voltage of 14.4V. It's dropped back to 13.32V with no external loads applied. Might this mean the battery is not good? It started out this morning at 12.4V.
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Re: New solar panels

Postby APR » Sun Jan 22, 2017 6:16 pm

The resting voltage of lead acid technology batteries is typically under 13 volt. If the battery pack is unused overnight the battery voltage can be expected to drop to the resting voltage, or close to it, by the next morning.

If you apply say a 1 amp load across a just charged battery pack for around an hour you will remove what is called the surface charge. The voltage you then have will be some indication of the resting voltage of the pack.

A bit of info about LA and SOC by voltage....

http://www.energymatters.com.au/compone ... discharge/
2 x Goodwe GW5048D-ES Hybrid inverters, 13kW panels, 20kWh LiFePO4
Mk2 PV Router feeding excess solar generation to a 3.6kW 250 ltr HWS
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Re: New solar panels

Postby crazyk » Sun Jan 22, 2017 6:23 pm

[Moderator - no need to quote the entire previous posting, it's just up there ^^^^!]



Great understand. Will also read that article.
Last edited by Gordon-Loomberah on Sun Jan 22, 2017 8:07 pm, edited 1 time in total.
Reason: removed unnecessary quoting
crazyk
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