What does Standby use mean?.

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Re: What does Standby use mean?.

Postby jules » Mon Jan 18, 2016 6:49 pm

Ah,
Since the boat only gets used 3 to 4 times a year max and when in water I'm only out there for maybe 5 to 6 hours maximum(Daytime
the full picture emerges! That sounds workable and of course you still have the oars I guess :D

Jules
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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Re: What does Standby use mean?.

Postby Smurf1976 » Mon Jan 18, 2016 9:50 pm

Cycle use = the charging voltage (that is, the voltage when actually being charged) if you are going to cycle the batteries (run then down then recharge later, eg if you are using them as a portable off-grid power source to run something then charging them later by whatever means).

Standby use = the voltage you'd set the charger to if you were going to leave it connected for an extended period (weeks, months, permanently) and are wanting to keep the batteries full awaiting use (eg as a backup power supply if mains power fails).

For standby use, too high a voltage will kill the batteries quickly due to gassing and internal corrosion. Hence the lower voltage.

For cyclic use, you want to actually charge the battery in a reasonable period of time and won't be leaving it permanently charging at that level, hence the higher voltage to get it charged.

In both cases, the voltage when the battery is just sitting there (not connected to any charger or load) will be lower. It varies slightly between types and brands, but full charge will be somewhere between 12.7 and 13.1 volts usually.

If storing the battery for an extended period (not being used) note that it will slowly but surely discharge itself. It needs to be kept above 12.4V at all times when in storage otherwise it will deteriorate excessively. Keeping an occasional check on the voltage (with a meter) and doing a periodic top up charge is the solution there.
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Re: What does Standby use mean?.

Postby convict » Tue Jan 19, 2016 2:43 pm

Thanks smurf1976. So if a battery is charge then put off charge with no load and it falls below 12.3v to 11.9v with in 5 days does that make it faulty.
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Re: What does Standby use mean?.

Postby Smurf1976 » Tue Jan 19, 2016 9:14 pm

Are you sure it was fully charged?

12.3V isn't full charge, should be 12.7 - 13.1 for full charge and to measure that accurately you need to remove any surface charge (putting a load on it for a couple of minutes then letting it rest for a while will give an accurate reading).

Assuming you're charging it at the recommended voltage for cyclic use, it needs to stay on charge until the current stabilises at a low level. Simply reaching the recommended voltage briefly doesn't mean it's fully charged, it just means that it's charged to the point where the current has fallen below what the charger can supply at maximum.
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