After really bad experiences with off the shelf UPS units, I have decided to build my own double-conversion UPS. I was planning on using the almost new 12v 9AH battery I already have. Its kinda small but I don't need long runtimes, I just want my PC to not shut off when the power goes out, or reboot like it does with these crap UPS units.
I have an inverter picked out already. A 600W pure-sine-wave 12VDC - 120VAC converter with good reviews. What I'm stuck on, is how to charge the battery. My setup peaks at about 370w. Normal usage is much much lower. <100w. So I'm thinking 35-40 amps on the charger should be able to handle the inverter load and charge the battery at the same time. The problem is, I really don't know how the charger will interact with the battery while they're both connected to the inverter. For example, how do I ensure the charger won't charge this small battery with too much amperage while still allowing the charger to power up to 370w on the inverter? Will it be a problem?
I have an inverter picked out already. A 600W pure-sine-wave 12VDC - 120VAC converter with good reviews. What I'm stuck on, is how to charge the battery. My setup peaks at about 370w. Normal usage is much much lower. <100w. So I'm thinking 35-40 amps on the charger should be able to handle the inverter load and charge the battery at the same time. The problem is, I really don't know how the charger will interact with the battery while they're both connected to the inverter. For example, how do I ensure the charger won't charge this small battery with too much amperage while still allowing the charger to power up to 370w on the inverter? Will it be a problem?