Installation

Special Instructions for 2020+ Winnebago Navion/View or any RV's with Mastervolt Chargemate

The Mastervolt Chargemate is a current limiting battery combiner, installed in 2020+ Winnebago Navion/View motorhomes. To maximize reliability, the House2Start charger must be isolated from the electrical system when the engine is running and the Mastervolt active. The recommended approach is to use an ignition-controlled relay to automatically disconnect House2Start. You can purchase a super simple relay kit on our webstore, or wire your own solution using the diagrams below.

The Mastervolt Chargemate is located under the passenger seat.

What Jumper setting should I use?

House2Start Charge Cycle Example

This example is for an AGM house battery & House2Start configured with jumper setting B. The turn on (rising) voltage is 13.1V (dashed horizontal purple line) and the turn off (falling) voltage is 12.8V (dashed horizontal green line).

1. Before the sun rises, the starter battery (orange) is slightly discharged at 12.5V, and the AGM house (blue) also discharged at 12.6V.

2. House2Start charger is OFF.

3. Around 6:30AM the solar charger activates and begins to charge the house battery.

4. At 7:12 AM (purple UP arrow) the house voltage (blue) rises above the 13.1V turn on threshold, which actives the H2S charger output.

5. H2S is charging the starter battery, which raises the voltage (orange).

6. 8:30-9AM the house solar charger is in absorption mode and the AGM house is held at 14.5V.

7. 9AM house solar charger switches from absorption to float charge (13.5V).

8. 10AM House2Start has reached absorption mode and the starter battery held at 14.5V.

9. 10:30AM House2Start absorption mode finished and switches to float mode for starter battery (13.5V).

10. 3:00PM house solar charger turns off and house battery voltage begins to decrease.

11. 3:36PM (green down arrow) house battery voltage falls below the 12.8V turn off threshold, which de-activates the House2Start charger output.

12. 4:00PM Starter battery voltage equalizes at ~12.8V, indicating it is fully charged.