Same situation here ... when we bought our Chateau V25, a Go Power GP-PWM-10-SQ was pre-installed with wiring to roof. Here's what I landed on for my solar upgrade ...
First upgrade:
Added 1 x 190w Go Power Solar Panel, Cost: $450
Upgraded wiring & decided to stay with the Go Power controller for now
Added 4 x VMAX 6v AGM, run parallel & serial, Cost: $1022
This gives me: 225ah at a cost of $1.14/ah
I've been VERY happy with this setup and we have not had any issues.
In September, I'll add an inverter and replace the PWM controller:
Xantrex 80A Freedom XC 2000w Inverter, Cost: $717
Xantrex Freedom X Bluetooth Remote Panel, Cost: $75
EPever 40A Tracer MPPT Controller, Cost: $75
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Jeff & Naomi & Ryu
2019 Thor Chateau V25
2022 Jeep Grand Cherokee Trailhawk
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