Alternator overcharging Volvo 05 VNL 630

Hello!

I have a Volvo VNL 630 with Volvo D12 engine.
I've installed power inverter 2500w connected directly to the batteries of the truck. http://www.whistlergroup.com/power-.../pro-2500w-power-inverters-product.aspx?id=32
Inside have a refrigerator and small microwave. Everything worked perfect for one year.
My alternator went bad and I've replaced it. Since then i have problems with the inverter.
On the dashboard computer i have readings from the batteries or alternator like 13.9; 14.0; 14.1; 14.2 but i have another gauge on my power inverter and there is reading of 14.5; 14.6.
If i try to turn on my refrigerator alarm starts from the power inverter and it shuts off. I don't know what can be. the Power inverter has protection from high voltage maybe it is activated?
I have cleaned all the contacts on the batteries, checked the wires connections from the batteries to the inverter every thing ok. I've found one bad battery and i've replaced. When i reconnected all the wiring i start the truck and i've had reading code ( mid 144 sid 230) some ( j link ) don't remember how it was. Anyway i turned off my truck and restated again, the code was gone.
But I have still the same problem my power inverter shuts off.

Has anyone have a solution or advice for this problem?
Thanks for any input!

 

i have installed one 300A fuse on the inverter on the + from the batteries to the inverter. The inverter works with small devices. but when i plug the refrigerator sometimes can work for few minutes and the alarm will turn on after that automatically turns off.
sometimes when the truck is not working everything works for hour or more and i can hear when the compressor from the refrigerator starts working the inverter starts beeping and it turns off.

 

I have tried the method that you suggested to me and still i have the same problem. I have pulled the fridge from my truck and installed in my home. It works perfect. It is confusing to me. The inverter works good with the vacuum cleaner witch has approximately 1000-1200 w. the fridge compressor has 180w and evan if it needs 10x more power to start operating it comes 1800w and the inverter is 2500w continuous.... It seems everything works separate but together no.
Is there a possibility the inverter or fridge to have some protection for short circuit or some thing and is automatically applied? Tnx for the answer, George

 

I have solved the problem with my current inverter. I've checked the inverter, the refrigerator and all other appliances. Every thing works good... The alternator, batteries ( changed only one) appliances, the connection (wires from the batteries to the current inverter) .
The problem was the GROUNDING from the refrigerator ( probably was making short circuit and the power inverter protection was shuting off the circuit) i've disconnected the grounding wire from the refrigerator and it works with no problems. The power inverter is still grounded to the chaises of the truck.
I want to thank to ALL of YOU for your help and advices to try solving the issue that i had.