Inverters 12v dc to 240v ac
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If you are using different batteries, or need to use more than two batteries, we recommend that you set up two separate battery banks and use them alternately. Battery selector switches are available from marine and RV dealers which allow you to select between two banks of batteries, or use both in parallel, or disconnect both from the load. (See Figure 8.)

Battery Tips
With the exception of sealed, gel cell batteries, lead-acid batteries emit hydrogen and oxygen gases, and sulfuric acid fumes when recharging. Vent the battery compartment to prevent accumulation of these gases, and do not install electronic or electrical equipment in the battery compartment. Do not smoke or carry an open flame when working around batteries.

2. The capacity of lead-acid batteries is temperature sensitive. Battery capacity is rated at 25 °C (77° F). At - 20°C (0°F) the ampere-hour capacity will be about half the rated capacity.

3. Do not leave batteries in a discharged state for more than a day or two. They will undergo a chemical process called sulfation which can permanently damage the batteries. Also, batteries will self-discharge over a period of 3 to 6 months, so they should be periodically recharged even if they are not being used.

4. If your batteries are not the "maintenance-free" type, check the electrolyte fluid level at least once a month. Use only distilled water to replenish the electrolyte fluid. Excessive fluid loss is a sign of overcharging.

5. Connections to battery posts must be made with permanent connectors that provide a reliable, low resistance connection. Do not use "alligator" clips. Clean the connections regularly and prevent corrosion by using an insulating spray coating or Vaseline.

6. Battery state of charge can be measured with a hydrometer or, more easily, with a voltmeter. Use a digital voltmeter that can display tenths or hundredths of a volt when measuring 10 to 30 volts. Make your measurements after the (12 volt) battery has not been charged or discharged for several hours. For a deep - cycle battery at 25°C (77°F), the following table maybe used: