vinke
New Member
Hi everybody,
Im having some troubles with the calculation of the battery size for my solar system. I have two small dc water pumps, 30W each.(12V,2.5A).
The two pumps work independent on each other and can be activated randomly. That, both may run at the same time. That would be the worst case situation and they will draw 5amps from my battery.assuming that any of the two pumps would run more than 30 minutes,how do i calculate the minimum battery Ah required, so that the load can be supplied when there is no sunlight without the battery gets drained too much.
Also I am incorporating a low voltage disconnect circuit in my system,to cater for the eventuality that my pumps runs longer and drains my battery. I would like some advice on how to calculate the low voltage disconnect point.I am perplexed because while on load the battery voltage may drop much below its actual voltage.
Some ideas and advice would be most welcomed.
Thanks
Im having some troubles with the calculation of the battery size for my solar system. I have two small dc water pumps, 30W each.(12V,2.5A).
The two pumps work independent on each other and can be activated randomly. That, both may run at the same time. That would be the worst case situation and they will draw 5amps from my battery.assuming that any of the two pumps would run more than 30 minutes,how do i calculate the minimum battery Ah required, so that the load can be supplied when there is no sunlight without the battery gets drained too much.
Also I am incorporating a low voltage disconnect circuit in my system,to cater for the eventuality that my pumps runs longer and drains my battery. I would like some advice on how to calculate the low voltage disconnect point.I am perplexed because while on load the battery voltage may drop much below its actual voltage.
Some ideas and advice would be most welcomed.
Thanks