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Old 11-17-15, 11:18 AM   #23
oil pan 4
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Join Date: Nov 2012
Location: NM
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Here is the new charge controller I need to put on.
15 amp Morningstar sunsaver MPPT charge controller.
For my configuration using AGM batteries I removed the negative load jumper and turned dip switch 1 on.
Dip switch 2 regulates load cut out voltage. I am leaving it off so shut off is at 11 volts, turning it on raises cut out voltage to 11.5v. Since I run a huge power inverter and use that battery for starting leaving the low voltage cut out switch off works best for me.
If you were only ever going to run all the loads through the "load terminals", thus limited to 15 amps then turning the low voltage cut out switch on would be recommended.

Dip switch 3 is equalize, I will turn it on if I ever think I need the panels to equalize for me.



Once installed you will see excessive fusing on inputs and outputs. MPPT controllers can not tolerate a short circuit fault on the input side while charging the batteries.
Each panels will be fused for slightly higher than what it produces and then all the panels together will only be on a fuse slightly higher than their output. Each 80 watt panel will be on a 7.5 amp fuse and then the fuse block will have a 15 amp fuse going to the charge controller and a 20 amp fuse going out to the battery. I figure each 80 watt panel will only produce 4 or 5 amps, so never more then 12 amps going into the charge controller and it will ramp that up to almost 15 amps on the output.

This is very unlike on the PWM controller where I just stuck 20 amp fuses on each panel and wired the fuse block into the charge controller and called it good.

I figure I can throw $10 or $15 worth of fuse holders on there and maybe not have to buy another $240 charger controller if something goes wrong.
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