You want to put in as much (or more really due to charge efficiency) as you take out. Is this a daily load? What percentage of capacity are you using each charge/discharge cycle? How long is the sun available?Hello
Have 6 volt 1.3 ah gel cell .
what is smallest amp size solar panel can use to full charge this battery?
mrel
So are you saying to full charge this battery 6 Volts @ 1.3 ah battery need .800ma solar panal ,what is solar panal voltage need to full charge ths battery.You want to put in as much (or more really due to charge efficiency) as you take out. Is this a daily load? What percentage of capacity are you using each charge/discharge cycle? How long is the sun available?
AFAIK a gel cell is based on the lead-acid type. Even "deep discharge" types should not be drained completely each cycle, if you want them to live. 50% is max, 25% is more reasonable.
So, assuming your daily load is 25% of capacity, your charge efficiency is 80%, and you have 5 hours of daylight to charge you'll need:
(1.3 AH ) * 25% / 80% / 5 hours = 0.8 Amps
Again, derate the current a cell produces by 80% so that brings us back to a 1 amp output.
I hope I've spurred some thoughts about how your system is being specified.
So are you saying to full charge this 6 volt 1.3 AH battery is to get a solar panel that is 7.5 volts at 100 ma solar panel is that right.Might want to boost V to about 10 OC, 7.5 V / .7 @ about 100 mA. SC. This assumes a light or no load and no time limit stated.
No, I said 10 V, OC, which will drop under load. Or a panel that will hold 7.5V under a load of 100 mA; this is bare bones- re read THE_RB's post.So are you saying to full charge this 6 volt 1.3 AH battery is to get a solar panel that is 7.5 volts at 100 ma solar panel is that right.
mrel
Nope, use the 1 amp number. The reason being the current is typically spec'd with an Irradiance 1000 W/m2, but 800 W/m2 is something typically expected. I omitted this point.So are you saying to full charge this battery 6 Volts @ 1.3 ah battery need .800ma solar panal ,what is solar panal voltage need to full charge ths battery.
mrel
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