Balencing the charging current between Solar Panel and electric battery charger.

NorthGuy

Joined Jun 28, 2014
611
50 Amp is the peak load current and may exist for a short period of time (for 2 to 10 minuets). Average load current is approx 20 +- 5A. It won't drain out as much quickly because solar is providing 6Amp constant charging. So if the load sucks 16Amp, battery discharge rate would be just 10Amp. Won't it?
If you discharge with 20A average load, the 100AH battery gets discharged in 2 hours (because you don't want to shorten the battery life by discharging it more than 50%). As you'll be discharging anyway, there's no need to limit current from the solar. If, at any point, all loads disconnect, and solar produces 6A, the battery voltage will rise, which will cause the charge controller to lower the current. However, IMHO, putting such high loads on the battery is pure madness.

If you want to charge from AC and draw load from inverter at the same time, it's a huge loss of energy which will dwarf the amount of energy that you get from the panel. The best way is to power some of the loads (looks like you have many) directly from AC, and to put other loads on the battery. Because of huge losses, AC charger should be used unly in emergency, e.g. when batteries are discharged and there's no sun to charge them back.

To keep the 100AH battery properly charged with solar, you'll need to double your panels to provide about 12A. This will produce enough energy to feed 2-3A average load.
 

Thread Starter

Mussawar

Joined Oct 17, 2011
95
If you want to charge from AC and draw load from inverter at the same time, it's a huge loss of energy which will dwarf the amount of energy that you get from the panel.
To keep the 100AH battery properly charged with solar, you'll need to double your panels to provide about 12A. This will produce enough energy to feed 2-3A average load.
So I should have at least 12A solar to handle the load. and yes, getting power from AC through inverter would be lose of energy.
It seems good to separate some loads and drive them from solar through inverter with 6Amp limit and handle the remaining loads directly from AC. As I add more solar panels, i can switch more loads to the solar. Thanks.
 

NorthGuy

Joined Jun 28, 2014
611
And if you get multiple solar chargers, it's perfectly Ok to connet them all to the same battery (if it can handle combined charging current) without any special provisions. In most cases, they won't interfere with each other.
 
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