Sycamore
New Member
My application is solar. I needed a relay to sense my battery voltage and if it drops to a certain voltage have a relay shut down or disconnect my inverter. The inverter is separate from my main house inverter. It's function is to power a Mr Cool Universal central air conditioner or a electric water heater. When the suns out my inverter solar charger charges at a higher voltage than the batteries are when the sun goes down. So I want the AC or Water Heater to be run by the Inverter at 53.5 volts or above. When solar is removed the batteries drop to 53 volts which is the settled voltage on my 48 volt LiPo4 system. So the relay is the 48V/220V model which I will set to 53.5 volt under voltage thresh hold to trigger the bottom relay section to open turning off my inverter. My concern was if it engaged and closed the relay again would there be a loop as the A/C Inverter when turned on would pull the voltage down again. WELL there is a "hysteresis" setting! Had to look that one up, lol. That is basically the spread when it engages or disengage again. It has a range of 0.1-30V on the 48V model with a default of 2.0V. I can set it at say 0.3 to have the relay reset at 53.8V or wherever I like it. On top of that there's a manual, auto and auto timed reset. So it can auto reset on those parameters or I can have it auto reset with a timer buffer of 0-.999 seconds (17 minutes). The manual says the power on delay and the reset delay is the same thing. You can also set a delay time (same range) for the activation of over or under voltage. The other question I asked and the seller answered is are the relays independent of the input, and they are. Also the relays, 2 of them are independent of each other...nice!
I was going to power a 80A 240V AC DPDT relay to disconnect the L1/L2 240V power out of the inverter to the A/C but after talking to Ean of Watts247 I am going to simply wire the relay in parallel with the inverters on/off switch. In parallel I can turn off the inverter switch and let the relay do the work or if I want to bypass the relay simply turn the inverter switch on. Turns out even if the inverters off the solar charger inputs from the panels to charge the batteries remain active.
RELAY: https://www.amazon.com/SVR1000-Prot...763H/ref=cm_cr_arp_d_product_top?ie=UTF8&th=1
I was going to power a 80A 240V AC DPDT relay to disconnect the L1/L2 240V power out of the inverter to the A/C but after talking to Ean of Watts247 I am going to simply wire the relay in parallel with the inverters on/off switch. In parallel I can turn off the inverter switch and let the relay do the work or if I want to bypass the relay simply turn the inverter switch on. Turns out even if the inverters off the solar charger inputs from the panels to charge the batteries remain active.
RELAY: https://www.amazon.com/SVR1000-Prot...763H/ref=cm_cr_arp_d_product_top?ie=UTF8&th=1
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