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Inverters and Stuff Today 10:00 – 11:30 Marshall Godwin Introduction • Topic • Using 2003 Discovery as reference system • Verify applicability to your coach • Speaker • Marshall Godwin • DOAI VP of Development 2 Terms • DC – Direct Current • AC - Alternating Current • Volts (E) 12Vdc, 120Vac • Current (I) – measured in amps • Power (P) – measured in watts P=IxE I=P/E • Converter/Inverter/Charger = Inverter 3 Discovery Power Sources • Alternating Current Sources (AC Power) • 1) Shorepower • 2) Generator • Direct Current Sources (DC Power) • 3) Batteries (Coach and Chassis) • 4) Alternator • 5) Solar Panels 4 Five Sources of Power in Your Discovery Below Drawing Does Not Accurately Reflect Discovery System 5 Batteries • Chassis Batteries • (2) 12V maintenance free Alliance A1031MFs connected in parallel • Each battery rating • CCA – 760 amps @ 00F, for 30 seconds 6 Chassis Battery Configurations • Parallel - Increases Amp Capacity • Two batteries in parallel will double the Amp rating of the battery bank while the voltage will be the same as each individual battery. + 12V 760 CCA - + 12V 760 CCA - + 12V 1520 CCA - 7 Batteries (Con’t) • Coach (or House) Batteries • (4) 6V flooded (wet cell) Trojan T105s connected 2 in series tied in parallel with the other 2 in series • Each battery rating • Amp Hours; • Total battery capacity with a constant discharge rate over a 20 hour period: 225 amps (11.25 per hour) before discharge (10.5v) • Reserve Minutes: • Capacity of Battery at constant discharge of 25 amps: 447 minutes (7.45 hours) before discharge 8 Coach Battery Configuration • Series - Increases Voltage • Two batteries in series will double the output voltage + + 6V 225 AH 6V 225 AH - - + 12V 450 AH + + 6V 225 AH 6V 225 AH - - - Avoid discharge below 50% to prolong battery life 9 Battery Test State of charge as related to specific gravity and open circuit voltage % of Charge Specific Gravity @ 80F Open-Circuit Voltage 6V Battery 12 Battery 100 90 80 70 60 50 1.277 1.258 1.238 1.217 1.195 1.172 6.37 6.31 6.25 6.19 6.12 6.05 12.73 12.62 12.50 12.37 12.24 12.10 40 30 20 10 1.148 1.124 1.098 1.073 5.98 5.91 5.83 5.75 11.96 11.81 11.66 11.5 Adjust for temperature by adding .004 to readings for every 10 deg above 80 F and subtract .004 for every 10 deg below 80 F 10 Xantrex Inverter/Charger • Freedom 458 and Freedom Combi 10 • Inverter – Modified Sine Wave • Continuous Power: 2000w (1000w) • Efficiency: • Full Load: 85% • Peak Efficiency: 92% • Example: 1200 watt load (microwave, hairdryer, toaster) • • • • I = P/E Current =1200/12 Current = 100 amps + efficiency loss Current = 118 amps • No load (idle mode) current draw - .12 amps 11 Freedom 458 12